Wiring up micro USB connectors

The Raspberry Pi has two micro USB connectors, one for power and the other for actual USB. For a compact head with both a Pi and an Arduino Nano, therefore, we need to fab some cables using DIY solder connectors, which I ordered a couple of months ago.

I wasn't sure how the four solder pads corresponded to the pinouts I need for power, and it turns out ... stuff is weird with the micro USB, which actually has *five* leads. One of which nobody uses - apparently it was for a protocol that didn't actually catch on. So many solderable micro USB connectors have five solder pads, but mine has only four.

 

Here are the pinouts.

Note that #2 is unused.

And here is the Pi, happily powered despite my horrible blobby soldering.